. >> president paid tribute to victims in newtown, connecticut. he joined religious leaders and mourners at a prayer vigil. he stresseded need for everyone to come together in an effort to stop horrific tragedies such as friday's shootings. >> since i've been president this the fourth time we have come together to comfort a grieving community torn apart by mass shootings. >> more than 900 people packed into newtown high school for an emotional service. they came to remember loved ones lost and left with the message those that died may help lead america to become better and safer for others. >> these tragedies must end. to end them we must change. in coming weeks i'll use whatever power this office holds in an effort aimed at preventing more tragedies like this. >> the entire community of newtown has transformed into one giant memorial with flowers, teddy bears and candles now piling up at a continuous pace seemingly everywhere here. >> there is no way you can be living and this doesn't affect you. >> they are trying to find out what prompted adam